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Related Concept Videos

Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

641
In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
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NMR Spectroscopy: Chemical Shift Overview01:15

NMR Spectroscopy: Chemical Shift Overview

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The position of the absorption signal of a sample is reported relative to the position of the signal of tetramethylsilane (TMS), which is added as an internal reference while recording spectra. The difference between the absorption frequencies of the sample and TMS (in Hz) is divided by the spectrometer operating frequency (in MHz) to obtain a dimensionless quantity called the chemical shift. It is reported on the δ (delta) scale and expressed in parts per million.
For instance, the proton...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.0K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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Proton (¹H) NMR: Chemical Shift01:07

Proton (¹H) NMR: Chemical Shift

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Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
Absorption signals of all the protium nuclei...
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¹H NMR of Labile Protons: Deuterium (²H) Substitution00:48

¹H NMR of Labile Protons: Deuterium (²H) Substitution

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This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.
886
¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons01:03

¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons

2.4K
Protons in identical electronic environments within a molecule are chemically equivalent and have the same chemical shift. The replacement test is a useful tool to identify chemical equivalence and predict NMR spectra. A substituent replaces each of the protons being examined and the resulting molecules are compared. If the same molecule is obtained, the protons are equivalent or homotopic. Replacement of any hydrogens in ethane by chlorine yields chloroethane because all six protons are...
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Pure Shift Nuclear Magnetic Resonance: a New Tool for Plant Metabolomics
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Solvent Suppression in Pure Shift NMR.

Emma L Gates1, Jonathan P Bradley2, Daniel B G Berry2

  • 1Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.

Analytical Chemistry
|February 21, 2024
PubMed
Summary
This summary is machine-generated.

Intense solvent signals in NMR spectra can obscure important data. A new method combines WATERGATE solvent suppression with pure shift NMR to achieve ultrahigh-resolution spectra, even with exchangeable protons.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Nuclear Magnetic Resonance (NMR)

Background:

  • Intense solvent signals in 1H solution-state NMR experiments distort spectra and mask solute signals.
  • Replacing solvents with perdeuterated forms is often impractical for in situ analysis, exchangeable protons, or cost reasons.
  • Solvent signal suppression techniques are essential for obtaining clear NMR spectra.

Purpose of the Study:

  • To develop an advanced NMR method for ultrahigh-resolution 1H NMR.
  • To suppress intense solvent signals while retaining exchangeable proton signals.
  • To address challenges in analyzing complex mixtures like pharmaceutical formulations.

Main Methods:

  • Combination of WATERGATE solvent suppression with pure shift NMR techniques.
  • Application of the developed method to analyze complex samples.
  • Demonstration on cyanocobalamin (vitamin B12 supplement) and atropine eye-drop formulation.

Main Results:

  • Achieved ultrahigh-resolution 1H NMR spectra.
  • Successfully suppressed intense solvent signals.
  • Retained signals from exchangeable protons, crucial for formulation analysis.
  • Demonstrated effectiveness in analyzing real-world samples.

Conclusions:

  • The combined WATERGATE and pure shift NMR method provides superior spectral quality.
  • This technique is valuable for analyzing complex mixtures and formulations where solvent suppression is critical.
  • Enables detailed analysis of samples with exchangeable protons without solvent replacement.